// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_MEDIA_SESSION_AUDIO_FOCUS_DELEGATE_ANDROID_H_
#define CONTENT_BROWSER_MEDIA_SESSION_AUDIO_FOCUS_DELEGATE_ANDROID_H_

#include <jni.h>

#include "base/android/scoped_java_ref.h"
#include "content/browser/media/session/audio_focus_delegate.h"

namespace content {

// AudioFocusDelegateAndroid handles the audio focus at a system level on
// Android. It is also proxying the JNI calls.
class AudioFocusDelegateAndroid : public AudioFocusDelegate {
public:
    static bool Register(JNIEnv* env);

    explicit AudioFocusDelegateAndroid(MediaSessionImpl* media_session);
    ~AudioFocusDelegateAndroid() override;

    void Initialize();

    bool RequestAudioFocus(
        AudioFocusManager::AudioFocusType audio_focus_type) override;
    void AbandonAudioFocus() override;

    // Called when the Android system requests the MediaSession to be suspended.
    // Called by Java through JNI.
    void OnSuspend(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);

    // Called when the Android system requests the MediaSession to be resumed.
    // Called by Java through JNI.
    void OnResume(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);

    // Called when the Android system requests the MediaSession to start ducking.
    // Called by Java through JNI.
    void OnStartDucking(JNIEnv* env, jobject obj);

    // Called when the Android system requests the MediaSession to stop ducking.
    // Called by Java through JNI.
    void OnStopDucking(JNIEnv* env, jobject obj);

    // Record when the Android system requests the MediaSession to duck.
    // Called by Java through JNI.
    void RecordSessionDuck(JNIEnv* env,
        const base::android::JavaParamRef<jobject>& obj);

private:
    // Weak pointer because |this| is owned by |media_session_|.
    MediaSessionImpl* media_session_;
    base::android::ScopedJavaGlobalRef<jobject> j_media_session_delegate_;

    DISALLOW_COPY_AND_ASSIGN(AudioFocusDelegateAndroid);
};

} // namespace content

#endif // CONTENT_BROWSER_MEDIA_SESSION_AUDIO_FOCUS_DELEGATE_ANDROID_H_
